Carbon-coated LiMn0.8Fe0.2PO4 cathodes for high-rate lithium-ion batteries

Advanced Composites and Hybrid Materials, Год журнала: 2024, Номер 7(2)

Опубликована: Март 22, 2024

Язык: Английский

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Enhancing the Mn Redox Kinetics of LiMn_0.5Fe_0.5PO₄ Cathodes Through a Synergistic Co‐Doping with Niobium and Magnesium for Lithium‐Ion Batteries

Small, Год журнала: 2024, Номер 20(47)

Опубликована: Авг. 13, 2024

The concerns on the cost of lithium-ion batteries have created enormous interest LiFePO

Язык: Английский

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Contribution of Ti-Doping to the Cyclic Stability of LiFe_0.6Mn_0.4PO₄/C

Industrial & Engineering Chemistry Research, Год журнала: 2024, Номер 63(18), С. 8228 - 8238

Опубликована: Апрель 26, 2024

Li(Fe0.6Mn0.4)1–xTixPO4/C cathode materials, with x values of 0, 0.01, 0.02, 0.03, and 0.04, were fabricated through a dual-stage synthesis process, incorporating both coprecipitation high-temperature solid-phase techniques. The composition, microstructure, surface morphology these materials thoroughly characterized using suite analytical These analyses confirmed the successful doping Ti ions into olivine lattice, resulting in decrease unit cell volume formation an amorphous carbon layer on particles' surfaces, which also improved particle dispersion. electrochemical performance samples was assessed techniques including constant current charge–discharge testing, cyclic voltammetry, impedance spectroscopy. findings showed that Ti-doping markedly diminishes potential polarization strong Ti–O coordination suppresses Jahn–Teller effect Mn3+, effectively enhancing stability lithium-ion diffusion rate material. Additionally, density functional theory (DFT) calculations conducted to assess impact LFMP. reveal reduces bandgap material increases bond length Li–O, thereby further confirming can enhance electronic conductivity. Among them, Li(Fe0.6Mn0.4)1–xTixPO4/C-3%Ti exhibited best performance. optimized sample demonstrated specific discharge capacity 163.53 mAh·g–1 at 0.1C, accompanied by initial coulombic efficiency 93.18%. At 1C, it provided 140.59 mAh·g–1, sustaining retention 93.58% after 500 cycles, delivered 94.08 5C.

Язык: Английский

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LiMn_0.8Fe_0.2PO₄/C Nanoparticles via Polystyrene Template Carburizing Enhance the Rate Capability and Capacity Reversibility of Cathode Materials

ACS Applied Nano Materials, Год журнала: 2024, Номер 7(4), С. 4024 - 4034

Опубликована: Фев. 7, 2024

In order to unlock the electrochemical performance ability of manganese-based lithium ferromanganese phosphate cathode materials, CP1–LiMn0.8Fe0.2PO4/C (coprecipitation) nanocomposites were prepared by introducing polystyrene nanospheres as templates and carbon sources into coprecipitation method combined with a multistage carburizing heat treatment. processes treatment, can not only build conductive layer optimize electron transport path but also refine particles inhibit nanoparticle aggregation. The interconnected coating significantly improves diffusion coefficient ions, which assists LiMn0.8Fe0.2PO4 in lifting discharge specific capacity cycle performance. test results show that as-prepared shows superior rate capability (130.5 mAh g–1 at 0.1C 92.8 5C) reversibility (95.5% after 200 cycles 0.5C).

Язык: Английский

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Boosting both electronic and ionic conductivities via incorporation of molybdenum for LiFe0.5Mn0.5PO4 cathode in lithium-ion batteries

Journal of Alloys and Compounds, Год журнала: 2024, Номер 989, С. 174396 - 174396

Опубликована: Апрель 4, 2024

Язык: Английский

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Multivalent Cation Incorporated into Manganese‐Iron Based NASICON Cathodes for High Voltage Sodium‐Ion Batteries

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Авг. 9, 2024

Abstract Na 4 Mn 1.5 Fe (PO ) 2 P O 7 (NMFPP), with its low cost and high energy density, is essential for accelerating the commercialization of sodium‐ion batteries. However, practical application limited by serious voltage hysteresis detrimental Jahn‐Teller distortions. Herein, a operating superior stable Nb‐doped NMFPP fewer intrinsic anti‐site defects are elaborately designed reconstruction crystal lattice electronic distribution. By introducing higher charge density Nb─O bonds, lengths Mn‐O bonds shortened, enhancing stability. As result, volume contracted during + extraction/insertion decreased niobium‐modified (Mn 0.5 2.94 Nb 0.06 , mitigating distortion from effect increasing capacity retention after 1000 cycles 57.5% to 82.3%. More importantly, delayed 2+ involvement in redox reactions significantly reduced, raising average 3.32 3.64 V overall 13%. This study opens new avenues develop advanced battery cathode materials long calendar life storage.

Язык: Английский

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Optimizing the Electrochemical Performance of Olivine LiMn_xFe_1–xPO₄ Cathode Materials: Ongoing Progresses and Challenges

Industrial & Engineering Chemistry Research, Год журнала: 2024, Номер 63(22), С. 9631 - 9660

Опубликована: Май 23, 2024

LiMnxFe1–xPO4 is the most promising olivine-type cathode material following LiFePO4 in terms of development potential. However, several technological challenges remain its widespread application, particularly low electronic conductivity, slow Li+ diffusion rate, and undetermined optimal Mn/Fe ratio. To date, enormous efforts have been devoted to addressing intrinsic defects facilitate electrochemical kinetics, some companies launched first-generation LiMnxFe1–xPO4. In this review, structural characteristics, lithium storage mechanism, synthesis methods are first introduced. Wherein, a particular emphasis placed on rational design precursors with tunable composition tailored architecture, encompassing Mn–Fe binary Mn–Fe–P ternary precursors. Then, up-to-date optimization strategies for improving performance LiMnxFe1–xPO4, such as ratio optimizing, conductive compositing, element doping, morphology controlling discussed comprehensively, special focus regulation additional discharge plateau, which not only prevents decrease energy density but also maintains consistency batteries. Finally, critical issues, existing challenges, new research directions, perspectives further commercialization discussed.

Язык: Английский

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Providing high stability to suppress metal dissolution in LiMn0.5Fe0.5PO4 cathode materials by Zn doping

Journal of Energy Storage, Год журнала: 2024, Номер 96, С. 112552 - 112552

Опубликована: Июнь 22, 2024

Язык: Английский

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Improved Electrochemical Performance of LiMn_0.6Fe_0.4PO₄ via Chitosan‐Derived Nitrogen‐Doped Carbon Coating

Batteries & Supercaps, Год журнала: 2024, Номер 7(7)

Опубликована: Апрель 15, 2024

Abstract The olivine‐type compound LiMn x Fe 1‐X PO 4 (LMFP) combines the advantageous characteristics of LiFePO and LiMnPO , including high energy density, extended cycle life, eco‐friendliness, cost‐effectiveness. However, its application is limited by certain challenges such as low electronic conductivity stability issues related to Jahn‐Teller effect induced Mn 3+ which hinder scalability. Here, we introduce an innovative approach applying nitrogen‐doped carbon layers, derived from chitosan both a nitrogen sources, encapsulate LMFP. This encapsulation significantly improves LMFP′s electrochemical performance compared those using sucrose‐derived coatings. LMFP cathode with coating exhibits specific capacity 156.8 mAh/g at 0.1 C, achieved first‐cycle Coulombic efficiency 96.8 %, maintained retention rate 94.6 % after 200 cycles 1 C. new method employing for producing coatings holds great promise enhancing usability in broader applications.

Язык: Английский

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Dual optimization of LiFePO4 cathode performance using manganese substitution and a hybrid lithiated Nafion-modified PEDOT:PSS coating layer for lithium-ion batteries

Electrochimica Acta, Год журнала: 2024, Номер 506, С. 145050 - 145050

Опубликована: Сен. 12, 2024

Язык: Английский

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